Up goes the wall

Claire and her 20 classmates are living a normal life until one day. A day that would tear her from her family for a year or more. On this day, all of the seventh-graders in America are but on trains and shipped off to an underground facility that belongs to Dow chemical company, where they are to begin a revolution: separating male and female. The seventh graders must work together to build a brick wall between the male and female districts. Only when the works is done can they return home. Will Claire and her classmates survive the build all while struggling the separation?